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"I'm very disappointed in what happened. Our locker room is a family," Bulls coach Fred Hoiberg said. "My job is not to let this moment derail us."

Portis and Mirotic were involved in a "serious altercation" at practice on Tuesday that eventually sent Mirotic to the hospital.

The incident allegedly occurred when Portis and Mirotic got into a shoving match during practice that ended with a cheap shot by Portis to the face of the 26-year-old. Mirotic later underwent tests and was diagnosed with a concussion in addition to a broken jaw and facial fractures from the fight.

Mirotic is out indefinitely and could require surgery after signing a two-year contract worth $27 million this offseason to return to the team. He is expected to miss four-to-six weeks, but he'll first need to clear concussion protocol.

The Bulls are scheduled to open their season Thursday in Toronto against the Raptors.